Отрывать ПДФ в браузере - не лучшая мысль.
The way that we've thought about this for a while is if you read the Chrome OS blog post that we did in July, and you read the Chrome browser blog post that we did in September in 2008, they're very similar. They're essentially the same thing. And the reason is because when we were building Chrome the browser, we realized that everyone is spending their time online. So essentially we were trying to build something that mimics this operating system feel—there's a task manager in Chrome, and that was one of the early additions to Chrome.
In the long term, we think of Chromium as a tabbed window manager or shell for the web rather than a browser application. We avoid putting things into our UI in the same way you would hope that Apple and Microsoft would avoid putting things into the standard window frames of applications on their operating systems.